Guthman, J. D. (1969). Metropolitan libraries: The challenge and the promise. American Library Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGuthman, Judith Dommu. Metropolitan Libraries: The Challenge and the Promise. Chicago: American Library Association, 1969.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGuthman, Judith Dommu. Metropolitan Libraries: The Challenge and the Promise. American Library Association, 1969.
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